CHRIS B STOCK / SCIENCE PHOTO LIBRARY CHRIS B STOCK / SCIENCE PHOTO LIBRARY
Bark damage to a mature English oak tree (Quercus robur). This damage has been caused by woodworm, with small holes visible in the wood in close-up. Woodworm is a generic term for the larval stage of several wood-boring beetles. Bark is the outermost layer of a woody plant such as a tree.
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